含铈聚硅氧烷的制备及其对甲基乙烯基硅橡胶性能的影响
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摘要
分别以α,ω-二羟基聚二甲基硅氧烷和八甲基环四硅氧烷与无水三氯化铈为主要原料制备含铈聚硅氧烷(PSC),研究其对甲基乙烯基硅橡胶(MVQ)性能的影响。结果表明:铈原子成功接到两种硅氧烷上,制得两种PSC;采用α,ω-二羟基聚二甲基硅氧烷制备的PSC可以提高MVQ的耐热老化性能,当其用量为5份时MVQ热老化前后的性能均较好;添加八甲基环四硅氧烷制备的PSC的MVQ物理性能和耐热老化性能优于添加α,ω-二羟基聚二甲基硅氧烷制备的PSC的MVQ;PSC可提高MVQ的热稳定性能,添加5份八甲基环四硅氧烷制备的PSC可使MVQ(二段硫化胶)最大分解速率温度提高122. 8℃;PSC在MVQ中分散性良好。
Polysiloxane containing cerium(PSC) was synthesized by using α,ω-dihydroxypolydimethylsiloxane or octamethylcyclotetrasiloxane,and anhydrous cerium trichloride as main raw materials,and the effect of PSC on the properties of MVQ was investigated. The results showed that,two kinds of PSC were successfully prepared by bonding cerium atom to siloxane. The PSC prepared from α,ω-dihydroxypolydimethylsiloxane could improve the heat aging resistance of silicone rubber. When 5 phr PSC was used,the performances of MVQ before and after thermal aging were good. The physical properties and heat aging resistance of MVQ with PSC prepared by octamethylcyclotetrasiloxane were superior to those of MVQ adding PSC prepared by α,ω-dihydroxy-polydimethylsiloxane. PSC could be well dispersed in MVQ and improve the thermal stability of MVQ. With 5 phr PSC prepared by octamethylcyclotetrasiloxane,the temperature at the maximum decomposition rate of MVQ(twostage cured vulcanizate) increased by 122.8 ℃.
Polysiloxane containing cerium(PSC) was synthesized by using α,ω-dihydroxypolydimethylsiloxane or octamethylcyclotetrasiloxane,and anhydrous cerium trichloride as main raw materials,and the effect of PSC on the properties of MVQ was investigated. The results showed that,two kinds of PSC were successfully prepared by bonding cerium atom to siloxane. The PSC prepared from α,ω-dihydroxypolydimethylsiloxane could improve the heat aging resistance of silicone rubber. When 5 phr PSC was used,the performances of MVQ before and after thermal aging were good. The physical properties and heat aging resistance of MVQ with PSC prepared by octamethylcyclotetrasiloxane were superior to those of MVQ adding PSC prepared by α,ω-dihydroxy-polydimethylsiloxane. PSC could be well dispersed in MVQ and improve the thermal stability of MVQ. With 5 phr PSC prepared by octamethylcyclotetrasiloxane,the temperature at the maximum decomposition rate of MVQ(twostage cured vulcanizate) increased by 122.8 ℃.
引文
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[3]卢琴芳,徐常龙,李小兵,等.耐高温硅橡胶实验制备及耐热性能研究[J].实验技术与管理,2013(9):50-52.
[4]李洪彦.碳纳米管协同氧化铁对硅橡胶热氧稳定作用及机理研究[D].天津:天津大学,2013.
[5]Kucera M,Lanikova J. Thermal Stability of Polydimethylsiloxane[J].Journal of Polymer Science,1961,54(160):375-379.
[6]MolGJ. HowtoGetMoreOutof ThemrogravimentricData[J].Polymer Preprint,1973,14(1):618-625.
[7]Clarke S R,Graiver D,Matisons J G,et al. Method of Making Dialkali Metal Silanolates and Siloxanolates[P]. USA:USP 5 969 173,1999-10-19.
[8]Grubb W T,Osthoff R C. Kneties of the Polymerization of a Cyclic Dimethylsiloxane[J]. Journal of Amercian Chemical Society,1955, 77(6):77-78.
[9]黄文润.热硫化硅橡胶[M].成都:四川科学技术出版社,2009:54-58.
[10]杨茜,方庆红,王娜,等.氧化铈对双组分室温硫化硅橡胶耐热性能的影响[J].合成橡胶工业,2012,35(4):304-307.
[11]张玉环,申屠宝卿,翁志学.金属化合物对硅橡胶耐热性能的影响[J].科技通报,2009,25(3):311-314.
[12]郑俊萍.过渡金属氧化物对硅橡胶耐热性能的影响[J].合成橡胶工业,1997,20(5):296-299.
[13]赵敏.耐高温耐油硅橡胶[J].橡胶工业,2017,64(3):185-185.
[14]陈诚,徐校,丁婉琦,等.导热绝缘防沉降室温硫化硅橡胶的制备与性能研究[J].橡胶工业,2016,63(7):412-416.
[15]周毅,周英志.耐热橡胶输送带概述[J].橡胶科技,2017,15(12):5-9.